sprintf.c: integer overflow

* sprintf.c (rb_str_format): fix a possible integer overflow and
  suppress implicit conversion warnings.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47600 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
regparse.c: remove unused variable

* regparse.c (add_ctype_to_cc): suppress a warning by removing
  unused variable.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47601 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
regenc.h: shrink PosixBracketEntryType

* regenc.h (PosixBracketEntryType): shrink by embedding `name` and
  reordering.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47602 b2dd03c8-39d4-4d8f-98ff-823fe69b080e